Individual Template Setting ignored for Mobile Devices

Description

We usually do the following to prevent creating specific mobile templates,

under administration layout set standard and mobile to the same theme, and optimize it to render same on mobile & desktop...

in pre-3.0 versions this behaved correctly if you have for example 2 different templates for a customer and one of it is explicitly set under "more - theme" in content editor for a page. the mobiles get the different template as well delivered.

past 3.0 this is ignored if mobile is detected, only the template under admin-layout is delivered to mobile, regardless of the settings you made for a single page...